Brake disc size?????

[The_WTBM]

went to buy new brake discs the other day and i find out that after putting my reg plate in 3 different sizes came up. 
my car = Audi a6 Avant 2010 2.0TDI 170bhp Lemans spec 
just wondered if there was a way of telling with out taking the disc off and checking 
cheers 

[Trevor]

Sometimes you can see it stamped into the outside edge of the disc otherwise its a case of taking the wheel off and measuring it up

 

[The_WTBM]

ok cheers they aint stamped so off they will have to come 

[Hoggy1972]

I just did my fronts this week. If you look on the chassis label either in the boot by the spare wheel, or in the handbook you'll see a 3 digit code, 1ZL or 1LG. If it says 1ZL then they are 347mm, if 1LG then 321mm. Hope that helps.

[jazz]

Just brought front set of brembo discs turns out there is a size diffrence the new one's are smaller than the one's fitted how do you know the correct size 

[niedzial1983]

On 5/28/2017 at 8:38 AM, Hoggy1972 said:

I just did my fronts this week. If you look on the chassis label either in the boot by the spare wheel, or in the handbook you'll see a 3 digit code, 1ZL or 1LG. If it says 1ZL then they are 347mm, if 1LG then 321mm. Hope that helps.

Exactly that ! 🙂

there was aslo 360mm for s6 and rs6